This photo was taken at the 2014 Official Power Morphicon Convention in Pasadena, California. It is featuring two cosplayers (their pages will be linked to below) as "Go-On" Gold and Silver from the Japanese show Engine Sentai Go-Onger.
The photo was taken outside the convention center at night, with the only lighting source being the lights at the entrance.
Photo from Power Morphicon 2014 for:
https://www.facebook.com/procrastiranger
https://www.facebook.com/Windycitytoku